/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/HeadMountedDisplayFunctionLibrary.h
Cross XR-System query that will list all XR devices currently being tracked.
A list of device identifiers matching the query. Use these to query and operate on the device (e.g. through GetDevicePose, AddDeviceVisualizationComponent, etc.)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Input|XRTracking") static [TArray](API\Runtime\Core\Containers\TArray)< [FXRDeviceId](API\Runtime\HeadMountedDisplay\FXRDeviceId) > EnumerateTrackedDevices ( const [FName](API\Runtime\Core\UObject\FName) SystemId, EXRTrackedDeviceType DeviceType )